Stretch Using Hardware

Stretch Using Hardware

Paul whoknows

Member #5,081

September 2004

I downloaded mame (last version), and I noticed very accurated and good looking resized modes, in fact you can resize your game window in real time and the image obtained is really good.
It uses 'stretch using hardware' for this purpose, what is this?, how it works?, sorry, but I have no idea.
I think is 3d accelerated hardware related, it's possible to implement resized windowed modes using stretch by hardware in allegro, or allegroGL?

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"The unlimited potential has been replaced by the concrete reality of what I programmed today." - Jordan Mechner.

Billybob

Member #3,136

January 2003

It probably draws the "screen" to a texture and then renders the texture on a polygon under OpenGL or DirectX, with nice filters and whatnot.

Paul whoknows

Member #5,081

September 2004

Then, I will need allegroGL to implement stretch by hardware :'(
My game is being developed in allegro.

____

"The unlimited potential has been replaced by the concrete reality of what I programmed today." - Jordan Mechner.

Evert

Member #794

November 2000

Allegro currently doesn't handle resizable windows (look for it sometime in 4.3, people are working on this).
Stretching of imagies is currently done in software, although there is no principle reason why it couldn't use hardware acceleration. I think AllegroGL may do that now, but I'm not sure. You'll have to check out the CVS version of AGL to make sure.

Oscar Giner

Member #2,207

April 2002

You don't need 3D acceleration for that. It can be done using overlay surfaces.

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Evert

Member #794

November 2000

Care to update the overlay driver?